File format changes from MPEG to .DVD
Here some steps that you can follow:


Set the video format to FFMPEG
Go in the Encoding drop-down just below the color settings in the bottom-left corner of the drop-down
In the Video drop-down, in the Video Codec settings, choose the H.264 settings
( I think your problem is that there might be a default setting in Blender)
Just to be safe Double-Check the Steps.
Check if there is any bug, or consult a video tutorial on how to report one